xfrm: validate new SA's prefixlen using SA family when sel.family is unset

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                        "net/xfrm/xfrm_user.c"
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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/xfrm/xfrm_user.c"
                    ],
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                        {
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                            "version": "0",
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                            "version": "5.4.285",
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                            "version": "6.11.6",
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                        {
                            "version": "6.12",
                            "lessThanOrEqual": "*",
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                            "versionType": "original_commit_for_fix"
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                    ]
                }